stealc | 3d78a99c4ca146da6281b4d37bae957e17b23c1439b72daac8584df46179bbfe

General

Target

3d78a99c4ca146da6281b4d37bae957e17b23c1439b72daac8584df46179bbfe.exe
Size

2.1MB
MD5

d2f26faa6e51839385b5b7bb9c8bdf94
SHA1

e35b9e92219faae2f10c6a67c5c450f1d0bf8a75
SHA256

3d78a99c4ca146da6281b4d37bae957e17b23c1439b72daac8584df46179bbfe
SHA512

34d85b01650375b1a1bfad518cd1ce920cf9e4b773f01381a5a493a1166a64fb944be3afa7a2fbee79e83803f9f3e9aa64b378f16949ca94c6fab7d537339d99
SSDEEP

49152:N6uDuaS9refuIJtTF+TxMoxc1TU+j+dAzGwlrh:N6uKb9TItIuoITsdZ

Score

10^/10

stealc vidar discovery spyware stealer

Malware Config

Extracted

Family

stealc

rc4.plain

Signatures

Detect Vidar Stealer 10 IoCs

stealer

resource	yara_rule
behavioral1/memory/2740-4-0x00000000033F0000-0x0000000003539000-memory.dmp	family_vidar_v7
behavioral1/memory/2668-17-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral1/memory/2668-22-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral1/memory/2668-23-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral1/memory/2668-18-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral1/memory/2668-15-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral1/memory/2668-167-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral1/memory/2668-186-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral1/memory/2668-217-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral1/memory/2668-236-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7

Stealc
Stealc is an infostealer written in C++.
stealer stealc
Vidar
Vidar is an infostealer based on Arkei stealer.
stealer vidar
Downloads MZ/PE file

Executes dropped EXE 1 IoCs

pid	Process
2668	kat1101.tmp

Loads dropped DLL 2 IoCs

pid	Process
2740	3d78a99c4ca146da6281b4d37bae957e17b23c1439b72daac8584df46179bbfe.exe
2740	3d78a99c4ca146da6281b4d37bae957e17b23c1439b72daac8584df46179bbfe.exe

Reads user/profile data of web browsers 2 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
spyware stealer

Data from Local System
T1005

Credentials In Files
T1552.001
Checks installed software on the system 1 TTPs
Looks up Uninstall key entries in the registry to enumerate software on the system.
discovery

Query Registry
T1012

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 2740 set thread context of 2668	2740	3d78a99c4ca146da6281b4d37bae957e17b23c1439b72daac8584df46179bbfe.exe	28

Checks processor information in registry 2 TTPs 1 IoCs

Processor information is often read in order to detect sandboxing environments.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	kat1101.tmp

Modifies system certificate store 2 TTPs 3 IoCs

evasion spyware trojan

Install Root Certificate

T1553.004

Modify Registry

T1112

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\SystemCertificates\AuthRoot\Certificates\5FB7EE0633E259DBAD0C4C9AE6D38F1A61C7DC25	kat1101.tmp
Set value (data)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\SystemCertificates\AuthRoot\Certificates\5FB7EE0633E259DBAD0C4C9AE6D38F1A61C7DC25\Blob = 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	kat1101.tmp
Set value (data)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\SystemCertificates\AuthRoot\Certificates\5FB7EE0633E259DBAD0C4C9AE6D38F1A61C7DC25\Blob = 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	kat1101.tmp

Suspicious behavior: EnumeratesProcesses 1 IoCs

pid	Process
2668	kat1101.tmp

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 2740 wrote to memory of 2668	2740	3d78a99c4ca146da6281b4d37bae957e17b23c1439b72daac8584df46179bbfe.exe	28
PID 2740 wrote to memory of 2668	2740	3d78a99c4ca146da6281b4d37bae957e17b23c1439b72daac8584df46179bbfe.exe	28
PID 2740 wrote to memory of 2668	2740	3d78a99c4ca146da6281b4d37bae957e17b23c1439b72daac8584df46179bbfe.exe	28
PID 2740 wrote to memory of 2668	2740	3d78a99c4ca146da6281b4d37bae957e17b23c1439b72daac8584df46179bbfe.exe	28
PID 2740 wrote to memory of 2668	2740	3d78a99c4ca146da6281b4d37bae957e17b23c1439b72daac8584df46179bbfe.exe	28
PID 2740 wrote to memory of 2668	2740	3d78a99c4ca146da6281b4d37bae957e17b23c1439b72daac8584df46179bbfe.exe	28
PID 2740 wrote to memory of 2668	2740	3d78a99c4ca146da6281b4d37bae957e17b23c1439b72daac8584df46179bbfe.exe	28
PID 2740 wrote to memory of 2668	2740	3d78a99c4ca146da6281b4d37bae957e17b23c1439b72daac8584df46179bbfe.exe	28
PID 2740 wrote to memory of 2668	2740	3d78a99c4ca146da6281b4d37bae957e17b23c1439b72daac8584df46179bbfe.exe	28

C:\Users\Admin\AppData\Local\Temp\3d78a99c4ca146da6281b4d37bae957e17b23c1439b72daac8584df46179bbfe.exe
"C:\Users\Admin\AppData\Local\Temp\3d78a99c4ca146da6281b4d37bae957e17b23c1439b72daac8584df46179bbfe.exe"
1⤵
- Loads dropped DLL
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:2740
- C:\Users\Admin\AppData\Local\Temp\kat1101.tmp
  C:\Users\Admin\AppData\Local\Temp\kat1101.tmp
  2⤵
  - Executes dropped EXE
  - Checks processor information in registry
  - Modifies system certificate store
  - Suspicious behavior: EnumeratesProcesses
  PID:2668

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Modify Registry

1

T1112

Subvert Trust Controls

1

T1553

Install Root Certificate

1

T1553.004

Credential Access

Unsecured Credentials

1

T1552

Credentials In Files

1

T1552.001

Discovery

Query Registry

2

T1012

System Information Discovery

1

T1082

Lateral Movement

Collection

Data from Local System

1

T1005

Command and Control

Exfiltration

Impact

Replay Monitor

Loading Replay Monitor...

Downloads

C:\Users\Admin\AppData\Local\Temp\Cab1602.tmp

Filesize
68KB

MD5
29f65ba8e88c063813cc50a4ea544e93

SHA1
05a7040d5c127e68c25d81cc51271ffb8bef3568

SHA256
1ed81fa8dfb6999a9fedc6e779138ffd99568992e22d300acd181a6d2c8de184

SHA512
e29b2e92c496245bed3372578074407e8ef8882906ce10c35b3c8deebfefe01b5fd7f3030acaa693e175f4b7aca6cd7d8d10ae1c731b09c5fa19035e005de3aa

Download Submit
C:\Users\Admin\AppData\Local\Temp\Tar1615.tmp

Filesize
177KB

MD5
435a9ac180383f9fa094131b173a2f7b

SHA1
76944ea657a9db94f9a4bef38f88c46ed4166983

SHA256
67dc37ed50b8e63272b49a254a6039ee225974f1d767bb83eb1fd80e759a7c34

SHA512
1a6b277611959720a9c71114957620517ad94541302f164eb872bd322292a952409bafb8bc2ac793b16ad5f25d83f8594ccff2b7834e3c2b2b941e6fc84c009a

Download Submit
\Users\Admin\AppData\Local\Temp\kat1101.tmp

Filesize
861KB

MD5
66064dbdb70a5eb15ebf3bf65aba254b

SHA1
0284fd320f99f62aca800fb1251eff4c31ec4ed7

SHA256
6a94dbda2dd1edcff2331061d65e1baf09d4861cc7ba590c5ec754f3ac96a795

SHA512
b05c6c09ae7372c381fba591c3cb13a69a2451b9d38da1a95aac89413d7438083475d06796acb5440cd6ec65b030c9fa6cbdaa0d2fe91a926bae6499c360f17f

Download Submit
memory/2668-11-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/2668-15-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/2668-17-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/2668-22-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/2668-23-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/2668-236-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/2668-18-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/2668-217-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/2668-13-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/2668-9-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/2668-207-0x000000001DFC0000-0x000000001E21F000-memory.dmp

Filesize
2.4MB

Download
memory/2668-167-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/2668-186-0x0000000000400000-0x0000000000646000-memory.dmp

Filesize
2.3MB

Download
memory/2740-4-0x00000000033F0000-0x0000000003539000-memory.dmp

Filesize
1.3MB

Download
memory/2740-0-0x0000000000220000-0x0000000000221000-memory.dmp

Filesize
4KB

Download
memory/2740-20-0x0000000000400000-0x000000000061C000-memory.dmp

Filesize
2.1MB

Download

Analysis

Sharing